Apollo 14 High-Ti Picritic Glass: Oxidation/Reduction by Condensation of Alkali Metals
Apollo 14 High-Ti Picritic Glass: Oxidation/Reduction by Condensation of Alkali Metals
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阿波罗 14 号高钛苦味素玻璃：碱金属缩合氧化/还原
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
J. Delano
中科院分区：
文献类型：
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作者：
J. Delano
介绍：石墨(C)在月球上苦质岩浆上升和喷发过程中的氧化还原反应中的作用已经有了很好的记录[例如，1-5]，特别是在阿波罗17号橙色玻璃（74220）中。苦晶玻璃表面出现升华物也是众所周知的[例如，6-9]。对阿波罗14号的高钛（~16 wt% TiO2）、黑色（微晶）焦化玻璃的电子探针分析表明，有证据表明添加了碱金属（即Na、K），并将FeO还原为金属铁。结果：对14301和14307风化角砾岩抛光薄片中的45个棕晶黑色小球体进行了电子探针分析（Si、Ti、Al、Cr、Fe、Mn、Mg、Ca、Na、K）。这些样品均为淬火的苦铁熔体微晶液滴。在一些球粒中，存在金属Fe （Fe0.996Ni0.004）相（图1）。
Introduction: The role of graphite (C) in oxidation-reduction reactions during the ascent and eruption of picritic magmas on the Moon has been welldocumented [e.g., 1-5], especially in the Apollo 17 orange glass (74220). The occurrence of sublimates on the surfaces of picritic glasses is also well-known [e.g., 6-9]. Electron microprobe analyses of the highTi (~16 wt% TiO2), black (microcrystalline) picritic glasses from Apollo 14 show evidence for addition of alkali metals (i.e., Na, K) with associated reduction of FeO to metallic Fe. Results: Electron microprobe analyses (Si, Ti, Al, Cr, Fe, Mn, Mg, Ca, Na, K) were acquired on 45 picritic black spherules in polished thin-sections of regolith breccias, 14301 and 14307. All of these samples were microcrystalline droplets of quenched picritic melt. In several spherules, a metallic Fe (Fe0.996Ni0.004) phase was present (Figure 1).